Patent GB-189806444-A (GB)
Title: Improvements in Upright Drilling and like Apparatus.
Inventor: BROOKES ALFRED GEORGE
Filed: 1898-03-16
Granted: 1899-03-16
Abstract: 6444. Brookes, A. G., [Cummings, H. H., and Crombie, A. D.]. March 16. Drilling.-In a pillar drilling-machine, the table carrier B<x> can be clamped on the pillar A by operating a clamping-lever b<x>. When the carrier is released, a screw shaft a engaging a nut in the carrier can be raised by a lever a<4> so that a bevelwheel a<2> on the upper end of the shaft is brought into engagement with a bevelwheel h<3> on the reversible main shaft H, causing the table to be moved vertically. A #-shaped casting G is secured to the pillar and to an arm A<8> on the pillar. This casting carries a sleeve bearing h for the main shaft, the bearing being encircled by the hub n of a loose pulley Nx with a concave friction disc N. A second friction disc M is secured on the shaft, and these are connected by two smaller dises g<x>, the inclination of which can be altered, forming a variable-speed gear as described in Specification No. 22,940, A.D. 1894. The discs g<x> are mounted in spindles carried in bearings g in the casting G and are geared together and to a lever R<3>. The free end of this lever engages a spiral rib R<1> on a revoluble plate R, provided with a number of holes to suit the shanks of the various drills used in the machine. The drill to be used is inserted in its corresponding hole and the plate R turned to bring it opposite a fixed index P. This shifts the friction gear through the lever R<3> to give the necessary speed for that particular drill. The main shaft can be moved longitudinally to disengage the friction discs M, N, and to bring a second friction disc N<1> into contact with the loose pulley N<x>. This reverses the shaft and is effected by a rod o<9> through an arm o' engaging a grooved collar on the shaft. The rod o<9> is connected to an arm o'‹, Fig. 9, on a shipper shaft o<12>, provided with a hand operating-lever. The drill spindle D, with a feathered sleeve c<x>, is mounted on an arm A<4> on the pillar and steadied by a traveller adjustably clamped on the pillar. The sleeve e<x> has concentric bevel-wheels c, c<1> either one of which may be driven by corresponding wheels h<6>, h<10> feathered on the main shaft, giving a fast or slow speed. The wheels h<6>, h<10> are connected to a hand-lever k<1> so that when one is engaged the other is disengaged. The spindle carries a non-rotating sleeve with a rack d\ and is fed by the rotation of a toothed wheel d' having a concentric pinion engaging the rack. This wheel may be rotated by a worm shaft d<10> or by a hand-wheel D<x>. In the latter case a latch lever d<22> is moved down to its lowest position to disengage the worm and to introduce an intermediate reducing-gear, allowing a fine feed to be given by hand. By moving the latch to its mid position and locking the hand-wheel to the wheel d' by a pin d<20>, a quick movement can be given to the spindle. The worm shaft is driven by a belt and pulleys a<12>, a<14>, the latter forming a friction disc and being loosely mounted on the shaft which it drives through discs a<15>, a<16> forming a variablespeed gear, as before. described, the upper disc a<15> being weighted and feathered on the shaft. The inclination of the discs a<16> is controlled by a handlever a<2>. The shaft passes through a sleeve forming a ball-and-socket bearing d<26> to permit of the displacement of the lower end of the shaft. The sleeve and the disc a<15> may be raised by turning a cam handle d<29>, thus stopping the feed. The bevelwheel c has slots with adjustable stops t<10>, t<20>, and the shipper shaft o<12> has a feathered boss t with arms t<1>, t<2>. By raising the boss till a pin on the spring t<3> engages a recess t<4> in a bearing o<13> the arms are brought into the path of the stops, which impart a rocking movement to the shipper rod, reversing the machine at short intervals.